“韦达定理”作为初中数学中重要的定理之一,应用十分广泛,但是由于通常对于“韦达定理”的应用是通过大量的公式变形和混合运算来达到目的的,这就需要有一定的数学基础和运算能力,而直接在定理的两个公式和推导思路中另辟新径:将数与数的运算先转变为字母系数间的关系,在最后一步再代入系数,“一步登天”,似乎更为便捷,也易于理解. “Veda’s theorem” is one of the important theorems in junior high school mathematics. It is widely used, but because the application of “Veda’s theorem” is usually achieved through a large number of formula deformations and mixed operations, this requires a certain degree of Mathematical fundamentals and computational capabilities, and directly in the theorem of the two formulas and derivation of ideas to open up new paths: the number and the number of operations first converted to the relationship between letter coefficients, in the final step and then substituting coefficients, “step to the sky,” it seems More convenient and easy to understand.